Abstract
Development of powdery mildew (Podosphaera leucotricha) on five popular cultivars of apple, viz., Scarlet Gala, Golden spur, Mollies Delicious, Red Fuzi and Red Chief was studied to determine incidence–severity relationship. The disease was confined primarily to the vegetative terminal shoots early in the season which also traversed later onto other leaves. Several biochemical changes occur in the trees due to fungal/microbial infection. We studied the qualitative/quantitative changes in phenolic acids in apple-powdery mildew pathosystems. Scarlet Gala and Red Chief are very rich in phenolic acids, and had shown resistances to the pathogen but those with low amount of phenolic acids, viz., Golden spur, Mollies Delicious, and Red Fuzi, were highly susceptible. Thus, the quantity of phenolic acids (secondary metabolites) has been taken as a biochemical parameter in screening apple cultivars for resistance/susceptibility against powdery mildew of apple.
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